Question # 1

The branch of physics which deals with the properties of fundamental particles is called:

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High energy physics

Molecular physics

Astrophysics

Space physics

N s m^-2is unit of:

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Drag force

Pressure

Surface tension

Coefficient of viscosity

Electromagnetic waves emitted by hot bodies are called:

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Photoelectrons

Alpha rays

Thermal radiation

None of these

When the emitter-base junction of a transistor is reverse biased, collector current

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Reverses

Increases

Decreases

Stops

A signal is amplified at the output without any change of phase, if it is applied at the

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inverting input

non-inverting input

at any of the input

none of these

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

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1.66 x 10^-29m

1.74 x 10^-10cm

17.4 x 10^-6m

1.74 x 10^-10m

Two forces each of the magnitude F act perpendicular to each other. The angle made by the resultant force with the horizontal will be:

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30°

45°

60°

90°

The distance covered by a body in unit time is called.

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Displacement

speed

Velocity

Both B and C

Improper biasing of a transistor circuit produces

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Heavy loading of emitter current

Distortion in the output signal

Excessive heat at collector terminal

Faulty location of load line

As the current flow through the wire:

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It generates heat in the wire

It produces sound in the wire

Resistance of the wire decreases

Voltage across the ends is increased

None of these

Through which character we can distinguish the light waves from sound waves

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Interference

Refraction

Polarization

Reflection

Magnetic flux passing through a element whose vector area makes an angle0º with lines of magnetic force is:

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BACosѲ

Zero

BA

BA sinѲ

None of these

A particle executes SHM with frequency. The frequency with which its K.E oscillates is

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f/2

2f

f

4f

Angle between the ray of light and the corresponding wavefront is:

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0°

60°

90°

120°

Whenever a covalent bond breaks, it creates:

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An electron

A hole

An electron-hole pair

A positron

All of these

Coulomb force, when any material medium is placed between two charges

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Increases

Decreases

Remain unchanged

None of these

An electric field is generated along the wire when:

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Its resistance is very high

A constant potential is maintained across the wire

Net current through the wire is zero

A constant potential difference is maintained across the wire

Either (A) or (D)

The waveform of alternating voltage is a:

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Square

Rectangular

Saw-tooth

Sinusoidal

None of these

The time taken to complete one vibration is called:

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Frequency

Amplitude

Time

Time period

Addition of 2.189 kg, 11.8 kg and 5.32 kg gives the rounded off answer as:

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19.398

19.400

19.4

19.3

______ plays the same role during angular motion as played by the mass in linear motion

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Torque

Angular Momentum

Moment of a force

Moment of inertia

The unit of conductance is

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ohm

meter

mho

ohm-meter

The special theory of relativity is based on:

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Four postulates

Three postulates

Two postulates

One postulate

None of these

A motorist travels A to B at a speed at 40 km/h and returns at speed of 60km/h. His average speed will be

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40 km/h

48 km/h

50 km/h

60 km/h

Depletion region contains:

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Protons

Positive ions

Negative ions

Both (B) and (C)

Both (A) and (C)

The pressure exerted by the gas is

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directly proportional to the P.E

inversely proportional to the P.E

inversely proportional to the K.E

directly proportional to the K.E

When a platinum wire is heated, it appears orange red at

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500°C

900°C

1100°C

1300°C

β-particles are easily deflected by collisions than heavy

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α-particles

β-particles

γ-particles

none of these

The quantity have dimension of ML²T⁰²will have SI unit of:

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Watt

Newton

Joule

Metre

A body moves a distance of 10 m along a straight line under the action of a force of 5 N and work done is 25J. the angle which the force makes with the direction of motion will be:

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60°

90°

30°

0°

According to the equation of continuity, when water falls from the tap, it's speed increases and its cross-sectional area

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decreases

increases

becomes zero

none of them

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